Antenna



FIG. 1 is a front elevation view of an antenna showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a side elevation view thereof;

FIG. 5 is an opposing side elevation view thereof;

FIG. 6 is a front elevation view thereof in use; and,

FIG. 7 is a bottom perspective view thereof in use.

The broken lines in FIGS. 6 and 7 illustrate environment only and form no part of the claimed design. 

CLAIM The ornamental design for an antenna, as shown and described. 